String: a sequence of characters, e.g.,” Hackr.io.”
Float: a floating-point (decimal) number, e.g., 23.456
Integer: an integer, e.g. 12
Boolean: represents two states – true, false.
Object: stores values of different data types into single entity, eg. apple = new Fruit();
Array: stores multiple values of same type, eg. array(“red”, “yellow”, “blue”)
NULL: when no value is assigned to a variable, it can be assigned NULL. For example, $msg = NULL;
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